A valve control device (50) controls the degree of opening of a pressure adjust-ment valve (44), and is provided in a gas turbine (12), which is equipped with: a combustor (22) that generates combustion gas by burning a fuel; a turbine (24) driven by the c...

In a silencer (1), holes (23) are disposed in one row with intervals to each other along one direction, holes (23) forming the one row are disposed in a plurality of rows in a direction perpendicular to the one direction, and positions of the holes (23) in...